How many miles per gallon do you get on highway on a 1998 Nissan Frontier 4-cylinder Manuel?

I have had two '99 4 cyl Frontiers that were automatic. Don't think there is any real difference in the '98 and '99. I got about 24-25 mpg driving mostly on the highway and some city driving. With a manual transmission, you will probably get a mile or two better unless you wind it out before changing gears.